Description
CAT 8T-4470 BEARING
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The CAT 8T-4470 is a Caterpillar single-row cylindrical roller bearing specifically designed for heavy radial loads. It is suitable for heavy-duty transmission components such as gearboxes, axles, and final drives. The following is a structured technical and application information.
Core Technical Parameters
Item Details
Basic Attributes Model 8T-4470, Type Single-row cylindrical roller bearing (inner/outer ring separable, straight flange), Material bearing steel (GCr15SiMn), carburized and quenched, Single weight approx. 1.8 kg, Applicable pressure radial ≤60 MPa, Applicable temperature -30℃ to +120℃, Lubrication method grease lubrication/oil lubrication, Clearance grade C3, Surface hardness HRC 60-64, Rated life ≥12000 hours
Key Dimensions Inner diameter 80 mm (tolerance P6), Outer diameter 140 mm (tolerance P6), Width 32 mm, Number of rollers 22, Roller diameter 10 mm, Length 28 mm, Inner ring flange diameter 105 mm, Outer ring flange diameter 115 mm, Chamfer 1.5 mm, Coaxiality ≤0.008 mm, Roundness ≤0.005 mm
Applicable Models and Locations Compatible with Cat 320D/323D excavator swing gearboxes, 966M loader gearbox three-axle differentials, and 140M grader axle differentials. 1-2 pieces per component. Suitable for speeds ≤4000 rpm.
Performance Parameters: Radial rated dynamic load 128 kN, radial rated static load 156 kN, grease-lubricated limiting speed 3600 rpm, oil-lubricated limiting speed 4500 rpm, recommended interference fit 0.012-0.022 mm. Suitable for speeds ≤3600 rpm.
Structural and Performance Advantages:
Separable Structure: Inner ring, outer ring, rollers, and cage are separable for easy installation, disassembly, and maintenance. Wear parts can be replaced individually, reducing maintenance costs.
Heavy Radial Load Compatibility: Cylindrical roller line contact design provides strong radial load capacity, suitable for heavy radial load conditions in gearboxes, axles, etc., preventing roller slippage during operation.
Precision Manufacturing Process: Carburizing and quenching treatment, surface hardness HRC 60-64, improving wear resistance and fatigue strength; C3 clearance adapts to high-temperature conditions, reducing the risk of thermal expansion and seizure.
High Reliability Design: Rollers and raceways are precision ground, roughness Ra≤0.1 μm, reducing friction and wear; rated life ≥12000 hours, suitable for heavy-duty impact conditions.
Installation and Maintenance Points: Before installation, clean the bearing, journal, and bearing housing, checking for cracks and peeling; heat the inner ring (80-100℃) for hot fitting or cold pressing, ensuring the rollers and flanges fit snugly; after installation, check radial clearance 0.015-0.025 mm.
Maintenance Cycle: Check the grease/oil condition every 1500 hours, replenish grease every 3000 hours (filling the bearing cavity with 1/3-1/2), measure the bearing clearance every 5000 hours, and replace the bearing if the clearance exceeds 0.25 mm. Replace the filter element regularly to maintain lubrication cleanliness at ISO 18/15.
Common Faults and Solutions: Bearing overheating is caused by insufficient lubrication or exceeding the speed limit; replenish lubrication and control the speed. Abnormal noises are caused by roller wear or foreign object intrusion; replace the bearing and clean the bearing cavity. Excessive clearance is caused by long-term wear or journal deformation; replace the bearing and repair the journal.
